xml 与 bean 的转化

package com.br.collectionai.web.controller.baiying;

import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

public class XmlToBean {

    /**
     * xml文件配置转换为对象
     * @param xmlPath  xml文件路径
     * @param load    java对象.Class
     * @return    java对象
     * @throws JAXBException
     * @throws IOException
     */
    public static Object xmlToBean(String xmlPath,Class<?> load) throws JAXBException, IOException{
        JAXBContext context = JAXBContext.newInstance(load);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        StringReader sr = new StringReader(xmlPath);
        Object xmlObject = unmarshaller.unmarshal(sr);
        return xmlObject;
    }


    public static Object convertXmlStrToObject(Class clazz, String xmlStr) {
        Object xmlObject = null;
        try {
            JAXBContext context = JAXBContext.newInstance(clazz);
            // 进行将Xml转成对象的核心接口
            Unmarshaller unmarshaller = context.createUnmarshaller();
            StringReader sr = new StringReader(xmlStr);
            xmlObject = unmarshaller.unmarshal(sr);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
        return xmlObject;
    }

    public static void main(String[] args) throws IOException, JAXBException {
//        String xmlPath =  "D:/testConfig.xml";
        String xmlPath =  "<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
" +
                "<list>
" +
                "    <student name="张三" number="10001" sex="男">
" +
                "        <className>尖子班</className>
" +
                "        <hobbys>
" +
                "            <hobby>篮球</hobby>
" +
                "            <hobby>音乐</hobby>
" +
                "            <hobby>乒乓球</hobby>
" +
                "        </hobbys>
" +
                "    </student>
" +
                "    <student name="李四" number="10002" sex="男">
" +
                "        <className>普通班</className>
" +
                "        <hobbys>
" +
                "            <hobby>篮球</hobby>
" +
                "            <hobby>音乐</hobby>
" +
                "            <hobby>乒乓球</hobby>
" +
                "        </hobbys>
" +
                "    </student>
" +
                "    <student name="莉莉" number="10003" sex="女">
" +
                "        <className>普通班</className>
" +
                "        <hobbys>
" +
                "            <hobby>篮球</hobby>
" +
                "            <hobby>音乐</hobby>
" +
                "            <hobby>乒乓球</hobby>
" +
                "        </hobbys>
" +
                "    </student>
" +
                "</list>";
        Object object = XmlToBean.xmlToBean(xmlPath,StudentList.class);
        StudentList students = (StudentList)object;
        List<Student> studentList = students.getStudents();

        for(int i=0;i<studentList.size();i++){
            System.out.println(studentList.get(i).name);
            System.out.println(studentList.get(i).sex);
            System.out.println(studentList.get(i).number);
            System.out.println(studentList.get(i).className);
            for(String str :studentList.get(i).hobby){
                System.out.print(str+" ");
            }
            System.out.println("-------------");
        }
    }
}

package com.br.collectionai.web.controller.baiying;


import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

public class BeanToXml {

    /**
     * java对象转换为xml文件

     * @param load    java对象.Class
     * @return    xml文件的String
     * @throws JAXBException
     */
    public static String beanToXml(Object obj,Class<?> load) throws JAXBException{
        JAXBContext context = JAXBContext.newInstance(load);
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
        StringWriter writer = new StringWriter();
        marshaller.marshal(obj,writer);
        return writer.toString();
    }
    public static void main(String[] args) throws JAXBException, IOException {
        List<String> hobby = new ArrayList<>();
        hobby.add("篮球");
        hobby.add("音乐");
        hobby.add("乒乓球");

        List<Student> studentList = new ArrayList<>();

        Student st = new Student("张三","男",10001,"尖子班",hobby);
        studentList.add(st);
        Student st1 = new Student("李四","男",10002,"普通班",hobby);
        studentList.add(st1);
        Student st2 = new Student("莉莉","女",10003,"普通班",hobby);
        studentList.add(st2);

        StudentList students = new StudentList();
        students.setStudents(studentList);
        String str =  BeanToXml.beanToXml(students, StudentList.class);
        System.out.println(str);
        //写入到xml文件中
        String xmlPath = "D:/testConfig.xml";
        BufferedWriter bfw = new BufferedWriter(new FileWriter(new File(xmlPath)));
        bfw.write(str);
        bfw.close();
    }
}

package com.br.collectionai.web.controller.baiying;

/**
 * @ClassName Student
 * @Description
 * @Author jiajun.cao
 * @Date 2020-11-27 14:45
 **/

import java.util.List;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlElementWrapper;


public class Student {

    String name;  //姓名

    String sex;    //性别

    int number;     //学号

    String className;    //班级

    List<String> hobby;    //爱好


    public Student() {

    }


    public Student(String name, String sex, int number,
                   String className, List<String> hobby) {
        this.name = name;
        this.sex = sex;
        this.number = number;
        this.className = className;
        this.hobby = hobby;

    }

    @XmlAttribute(name = "name")


    public String getName() {
        return name;

    }


    public void setName(String name) {
        this.name = name;

    }


    @XmlAttribute(name = "sex")


    public String getSex() {
        return sex;

    }


    public void setSex(String sex) {
        this.sex = sex;

    }


    @XmlAttribute(name = "number")


    public int getNumber() {
        return number;

    }


    public void setNumber(int number) {
        this.number = number;

    }


    @XmlElement(name = "className")


    public String getClassName() {
        return className;

    }


    public void setClassName(String className) {
        this.className = className;

    }

    @XmlElementWrapper(name = "hobbys")

    @XmlElement(name = "hobby")


    public List<String> getHobby() {
        return hobby;

    }


    public void setHobby(List<String> hobby) {
        this.hobby = hobby;

    }
}

package com.br.collectionai.web.controller.baiying;

/**
 * @ClassName StudentList
 * @Description
 * @Author jiajun.cao
 * @Date 2020-11-27 14:48
 **/

import java.util.List;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "list")
public class StudentList {

    List<Student> students;    //所有学生信息的集合

    @XmlElement(name = "student")
    public List<Student> getStudents() {
        return students;
    }

    public void setStudents(List<Student> students) {
        this.students = students;
    }

}